# 列表嵌套：列表中包含列表
# [[], [], []]                          # 0     1    2(-1)
stu_info = [['mike', 18, 'app自动化'],  ['tom', 19, 'web自动化'], ['rock', 20, '接口自动化']]
#                   0                               1                   2
print(stu_info[1])  # ['tom', 19, 'web自动化']
print(stu_info[1][2])
print(stu_info[1][-1]) # 'web自动化'
